“She does not want to do any crawling, she just wants to go from sitting to standing, and then walking,” the actress told PEOPLE while attending the Shondaland #TGIT Celebration in Beverly Hills.

“She refuses to crawl, even though everybody her age is crawling.”

According to the Grey’s Anatomy star, her baby girl‘s independent streak is such that she is actually trying to skip a key developmental stage.

“She just wants to walk, so she does this thing where she will pull herself up, and because she doesn’t want to hold on to anything, she’ll stand up,” she explains. “You can see the terror in her face as she is about to fall over. I catch her, obviously … Usually.”

“I was in total denial that it was happening,” the Grey’s Anatomy star, who had been due Dec. 27, tells PEOPLE in its latest issue. “All of the baby stuff was in boxes in the basement and there was nothing prepared.”

But after giving birth toHannah Mali Rose on Dec. 3, Drew — who’s also mom to sonMicah Emmanuel, 3, with husband Peter Lanfer — was “beside herself” when the newborn faced serious health complications. As a result, the couple’s baby girl had to spend 11 days in the neonatal intensive care unit.

“Her lungs were not totally ready to be outside of the womb [which led to] an infection, plus she had issues with blood sugar because I had gestational diabetes,” the actress explains. “It’s the worst thing in the world because you go into the hospital and you expect to leave with your baby. We didn’t know how long she would have to be there.”

Despite keeping the sex a delivery surprise, the couple add, 2½-year-old son Micah Emmanuel “somehow knew she’d be a girl from the moment we told him we were pregnant. He is over the moon to be a big brother to sweet Hannah.”

After starting off her second pregnancy with severe morning sickness, Sarah Drewis now taking frequent trips to the bathroom throughout the night, has a strict feeding schedule and is constantly fighting a craving for sweets.

But looks can be deceiving. Despite the rough ride, the actress admits she’s enjoying the experience in a way that she was unable to when pregnant with her now 2½-year-old sonMicah Emmanuel.

“The first time it wasn’t just the physicality, it was the emotional weight, too,” the Grey’s Anatomy star tells Fit Pregnancy‘s October/November issue.

“I was mourning the end of a massive chapter in my life … I knew I’d have to sacrifice a lot more than I was used to sacrificing, but I didn’t know how it was going to look and I didn’t know if I was going to be a good mom.”

Sarah Drew has already raved about her musically inclined sonMicah Emmanuel, but apparently he’s a double threat, because nowadays his golf skills are also getting noticed.

Yes, at just 2-years-old, the son of the Grey’s Anatomy star “has three golf clubs that he uses,” Drew, 33, recently told PEOPLE.

“He puts balls into holes, he drives balls off of tees, he actually gets the ball up off the ground and into the sky. It’s ridiculous.”

Adds the actress, “He is obsessed with golf. Golf is his most favorite thing. We’re members at a golf club. My husband is an amazing golfer and just loves it there and I love it there. We go and have family outings there all the time. He will be spending lots of time at the golf club with his daddy in the future, for sure.”Read More